GCSE Edexcel Physics Combined Science Circuit devices & IV Graphs: 1 (a) Figure 1 shows the results

1 (a) Figure 1 shows the results from an experiment where the potential difference (voltage) across a filament lamp was varied - Edexcel - GCSE Physics Combined Science - Question 1 - 2021 - Paper 1

Question 1

1-(a)-Figure-1-shows-the-results-from-an-experiment-where-the-potential-difference-(voltage)-across-a-filament-lamp-was-varied-Edexcel-GCSE Physics Combined Science-Question 1-2021-Paper 1.png

1 (a) Figure 1 shows the results from an experiment where the potential difference (voltage) across a filament lamp was varied. The current and voltage were measure... show full transcript

Worked Solution & Example Answer:1 (a) Figure 1 shows the results from an experiment where the potential difference (voltage) across a filament lamp was varied - Edexcel - GCSE Physics Combined Science - Question 1 - 2021 - Paper 1

Step 1

Describe the relationship between the current and the voltage as shown in the graph in Figure 1.

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Answer

The graph shows a positive correlation between the current and voltage. As the potential difference (voltage) increases, the current also increases. However, the graph indicates that this increase occurs at a decreasing rate as voltage rises, suggesting a non-linear relationship rather than a directly proportional one.

Step 2

Use the values of the voltage and current at point P and at point Q on the graph in Figure 1 to complete the table in Figure 2.

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Answer

Point	Voltage (V)	Current (mA)
P	2.0	40
Q	5.0	55

Step 3

Calculate the resistance of the filament lamp when the voltage is 4.5V and the current is 51 mA.

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Answer

To calculate the resistance (R), we can use the formula: $R = \frac{V}{I}$ Substituting the values: $R = \frac{4.5V}{51mA} = \frac{4.5V}{0.051A} \approx 88.24 \Omega$

Step 4

Explain why the resistance of the filament lamp changes as the voltage increases.

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Answer

As the voltage increases, the filament lamp heats up, causing the resistance to increase. This occurs because the temperature rise in the filament results in greater atomic vibrations, which in turn obstructs the flow of electrons, thereby increasing resistance.

1 (a) Figure 1 shows the results from an experiment where the potential difference (voltage) across a filament lamp was varied - Edexcel - GCSE Physics Combined Science - Question 1 - 2021 - Paper 1

Worked Solution & Example Answer:1 (a) Figure 1 shows the results from an experiment where the potential difference (voltage) across a filament lamp was varied - Edexcel - GCSE Physics Combined Science - Question 1 - 2021 - Paper 1

Describe the relationship between the current and the voltage as shown in the graph in Figure 1.

Use the values of the voltage and current at point P and at point Q on the graph in Figure 1 to complete the table in Figure 2.

Calculate the resistance of the filament lamp when the voltage is 4.5V and the current is 51 mA.

Explain why the resistance of the filament lamp changes as the voltage increases.

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